title: Cd isotopes as a potential source tracer of metal pollution in river sediments.
abstract: Tracing the sources of heavy metals in water environment is key important for our understanding of their pollution behavior. In this present study, Cd concentrations and Cd isotopic compositions in sediments were determined to effectively identify possible Cd sources. Results showed that elevated concentrations and high enrichment factor for Cd were found in all sediments, suggesting anthropogenic Cd origin. Cd isotopic compositions in sediments yielded relative variations ranged from -0.35‰ to 0.07‰ in term of δ(114/110)Cd (the mean: -0.08‰). Large fractionated Cd was found in sediments collected from a smelter and an E-waste town. Cd isotopic compositions and Cd concentrations measured in sediments allowed the identification of three main origins (dust from metal refining (δ(114/110)Cd < 0), slag of metal refining (δ(114/110)Cd > 0), and those δ(114/110)Cd = 0, such as background and mining activity). According to the actual precision obtained, Cd isotopes could be a potential tool for tracing metal pollution sources in water environment.
authors.affiliation: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China. gaosky34@hotmail.com
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.forename: Haidong
authors.initials: H
authors.lastname: Zhou
authors.forename: Xirong
authors.initials: X
authors.lastname: Liang
authors.forename: Xianglin
authors.initials: X
authors.lastname: Tu
mesh_terms: D002104:Cadmium / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D007554:Isotopes / Q000032:analysis; D008906:Mining; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007554:Isotopes; D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Cadmium isotopes; Cd pollution; Enrichment factor; Sediments; Source identification